A. Abstract In 1995, an improvement project was completed on the 244 klystron modulators in the linear accelerator. The modulator system has been previously described [ 11. This article offers project details and their resulting effect on modulator and component reliability. Prior to the project, we had collected four operating cycles (1991 through 1995) of MTTF data [2]. In this discussion, th...

Un-availability can be quantitatively defined as the ratio of MTTR (mean time to repair) to the sum of MTTR (mean time to repair) and MTTF (mean time to failure). Decreasing MTTR is as valuable as increasing MTTF. By learning why systems fail, failure distribution across parts of an IS, we attempt to envision a plausible model for future Information Technology (IT). In this endeavor, we focus o...

Wireless sensor networks (WSNs) present several unique characteristics such as resource-constrained sensors, random deployment, and data-centric communication protocols. These characteristics pose unprecedented challenges in the area of query processing in WSNs. This dissertation presents the design and validation of adaptive fault tolerant QoS control algorithms with the objective to achieve t...

3D integrated circuits (3DICs) with through-silicon vias (TSVs) are an important direction for semiconductor-based products and “More than Moore” scaling. However, 3DICs bring simultaneous challenges of reliability (power and temperature in stacks of thinned die) as well as variability (performance and power) in advanced technology nodes. In this paper, we study variability-reliability interact...

Abstract One of the most important reliability parameters is mean time to failure (MTTF). It widely accepted that MTTF equal life E T . This article shows this not necessarily true. Although for commonly used statistical distributions (such as exponential, Gaussian, chi-square, Fisher-Tippett distributions) values and are equal, case log-normal distribution. Similarity, some less Breit-Wigner d...

This paper presents the reliability studies of fault-tolerant Zeta Networks (ZTNs): a MIN, designed specially for an irregular class of hybrid networks. The reliability of ZTNs under Dynamic Full Access (DFA) is studied. The metrics used are mean time to failure (MTTF) and cost-effectiveness. Studies of tight Upper Bound (UB) and Lower Bound (LB) of the MTTF shows that ZTNs are more reliable an...

Bit faults induced by single-event upsets in instruction may not cause a system to experience an error. The instruction vulnerability factor (IVF) is first defined to quantify the effect of non-effective upsets on program reliability in this paper; and the mean time to failure (MTTF) model of program memory is then derived based on IVF. Further analysis of MTTF model concludes that the MTTF of ...

A method of evaluating the single-event effect soft-error vulnerability of space instruments before launched has been an active research topic in recent years. In this paper, a multi-signal flow graph model is introduced to analyze the fault diagnosis and meantime to failure (MTTF) for space instruments. A model for the system functional error rate (SFER) is proposed. In addition, an experiment...

Original scientific paper The multiplex (MUX) control system of subsea blowout preventer (BOP) plays a vital role in providing safe working conditions for the subsea drilling activities. According to the working states and critical failure modes of the MUX control system, this paper presents its stochastic Petri nets (SPN) model, taking into account the imperfect fault detection capacity. The n...

The purpose of this research was to design and develop a machine Smart Machine Health Monitoring device (SMHM) for traditional manufacturing units based on the industry 4.0 (I4.0) concept. tool performance has been demonstrated using metrics such as overall equipment effectiveness (OEE), mean time between failure (MTBF), (MTTF). rejection rate unscheduled downtime were reduced by 68.04 percent ...